The Backrooms (Immersive Portals)

If your not careful and noclip out if reality in wrong areas, you'll end up in the backrooms, where it's nothing but the stink of moist carpet, the madness of mono-yellow, and endless background noise of fluorescent lights at maximum hum-buzz, and approximately six hundred million square miles of randomly segmented empty rooms to be trapped in. Now with Immersive Portals, and also not six hundred million square miles but we don't need to talk about that.

Credit to csx42 on YouTube for the idea.